Quote:
Originally Posted by Brian
So, how does oil being dumped by the relief valve get heated anymore than the oil flowing through the bearings, removing heat from the bearing as it does so? If the oil going through the bearing is removing heat from the bearing, it is doing so by absorbing that heat. Oil returning to the oilpan through the relief valve is doing exactly that; returning to the pan. So how is it getting heated? Surely it is at the same temperature upon leaving the pump as the remainder of the oil that circulates throughout the rest of the engine?
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It takes energy to move the oil. The higher the pressure and flow rate, the more energy required to move it. I think the biggest issue is the energy losses. The energy loss can be in the form of heat. But the main activity going on is more resistance in the pump to move more oil. And a lot of that energy is being dumped out the relief valve.